Section of soil or waste stack corresponding to one story in height is a branch interval. Thus the correct option is option D.
Branch interval is a term used to describe the vertical distance between horizontal branches that connect to a drainage stack, which must be at least 8 feet (2438 mm) in developed length. From the highest horizontal branch connection, measurements are taken down the stack.
There are frequently additional requirements for allowable loading in addition to the fundamental FU loading; in this case, a "branch interval" may refer to the number of stories permitted to drain to a specific stack diameter. The criteria for a 6in stack only permits a maximum of 4 branches or stories to be drained to it, so a 6in stack may handle x FU from 5 stories.
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